The Vietnam veteran speaking at a ceremony to mark his farewell from the FBI

What was his first job?

His first job was with a law firm and then in 1976 joined the US Attorney's office in the Northern District of California as a prosecutor.

Mueller worked for worked for 12 years in the US Attorney offices, with spells at law firms in between, and was known for his tough, no-nonsense managerial style.

He investigated and prosecuted crimes ranging from major financial fraud to public corruption cases.

In 1990, he became head of the criminal division of the US Department of Justice.

During his time in that role, he oversaw the high-profile investigations of Panamanian leader Manuel Noriega, the Gambino crime family boss John Gotti and the Lockerbie bombing.

From 1998 to 2001 he was US Attorney - the chief prosecuting officer - for the Northern District of California.

He also had a spell for Deputy Attorney General for six months in 2001.

In July that year, the Justice Department announced Mueller had surgery for prostate cancer after being diagnosed in April.

What did Mueller do at the FBI?

Mueller was nominated for the position of FBI director by President George W. Bush, beating off competition from two other high profile lawyers.

He was sworn as the sixth director of the agency on September 4, 2001 and was immediately thrust into the hunt for terrorists linked to the 9/11 attacks.

Mueller transformed the FBI into a counterterrorism agency, expanding its manpower and shifting 2,000 of its 5,000 agents from fighting crime to national security.

As director, he earnt a reputation as a hard taskmaster whose relentless energy and demands meant he went through five chiefs of staff in his first four years.

He would publicly reprimand agents who used the words “linked” or “associated” with al-Qaeda rather than produce hard evidence, Garrett M. Graff’s wrote in his “The Threat Matrix” book about the hunt for the 9/11 terrorists.

In 2009, he wrote to Scotland's then justice secretary Kenny MacAskill to condemn the decision to release Abdelbaset Ali Al Megrahi, who was convicted over the Lockerbie bombing.

Muller said the decision was as “inexplicable as it is detrimental to the cause of justice” and “makes a mockery of the rule of law” while it also “gives comfort to terrorists”.

He went on to become the longest serving director of the FBI since J. Edgar Hoover.

The Senate voted 100-0 to change the law so he could extend his tenure by two years and he left in in 2014.

What did his report on Trump find?

Speaking to reporters at Palm Beach in Florida, Trump said "It's a shame that our country has had to go through this" and "hopefully somebody's going to look at the other side".

He described the inquiry as an "illegal take down that failed" and said the idea of collusion with Russia was "the most ridiculous thing I've ever heard".

Mueller spent almost two years examining potential Russian interference in the 2016 presidential election.

He also investigated whether Trump obstructed justice, but could not come to a definitive answer, Attorney General William Barr said in a letter to Congress summing up the report.

But the special counsel did "not exonerate" Trump of obstructing justice, Barr added.

After consulting with other Justice Department officials, Barr said he and Deputy Attorney General Rod Rosenstein found the evidence was "not sufficient to establish that the president committed an obstruction of justice offence."

On May 1, 2019, it emerged that Mueller would testify to Congress about his findings.

The Special Counsel's letter to Barr last month said he was worried that a document summarising the main conclusions of the probe lacked the necessary context and was creating public confusion about his team's work.

Mueller and Barr then had a phone call where the same concerns were addressed, it has been reported.

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Was the full report released?

The "Game of Thrones" inspired tweet came as Attorney General William Barr made public the findings of former FBI director Mueller's probe into the Trump campaign's contacts with the Kremlin and allegations of obstruction of justice by the president.

The 400-page report marks the culmination of former FBI director Mueller’s 22-month investigation and was first submitted to Barr at the end of last month.

US President Donald Trump responds to Robert Mueller report saying the idea of collusion with Russia was the 'most ridiculous thing I've ever heard'